Singlespeed & Fixed Gear - Sugino 75+IRO BB ?

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whatup
07-02-08, 10:59 AM
As the title says, has anyone tried running the IRO BB with Sugino 75's.

110mm-IRO-Sealed

109mm-75bb-loose

For ~$30.00 it seems like a good deal for a sealed bb that will fit the 75.

Gordo789
07-02-08, 02:31 PM
wouldnt the chainline only be off by like 0.5mm? thats not bad.
thequickfix
07-02-08, 02:35 PM
Sugino 75 cranks have an ISO taper (search for a number of redundant threads on this topic).

Although the IRO BB is close enough in length, it is likely that the taper is JIS or something else entirely. There is much debate over whether you can mix taper specs, but you run the risk of damaging your cranks and rendering them useless (search for a number of redundant threads on the taper mixing debate). Also, different taper specs will likely position the chainline differently, meaning that, despite a similar length spindle, the two bottom brackets may interface at a different distance with the same crank.

I would say that it is probably possible, but not something that I would recommend.

SuperVillain
07-02-08, 03:01 PM
If you're spending that kind of money on Sugino 75s, might as well get the BB that is made to go with them.
bornagainst
07-02-08, 05:04 PM
If you're spending that kind of money on Sugino 75s, might as well get the BB that is made to go with them.+1 Or a Phil. Why put a $200 crank on a $30 bb. If you must go cheap then your best option is the Miche Primato which is ISO and adjustable to get your chainline just right. And it's around $30(or less).
beethaniel
07-02-08, 06:06 PM
I have the IRO bb on my IRO, and Im running a set of Dura Ace cranks, which work with the same size taper and length BB as the Suginos. Its a perfect fit, not as nice as the Sugino BB I have on my other bike, but perfect for the IRO as its my basket/beater bike. I am going to get the same BB for my other bike to use with the Suginos once the I kill the Sugino BB I have on there now. The non drive side crank arm is out a little bit further than the drive side, but I get perfect chainline with a Phil rear hub.

I say get one, works great, its sealed, and is super cheap (I got mine at Montano Velo for about 15 bucks)
operator
07-02-08, 07:21 PM
Looks like someone hasn't learned the search function.